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CVE-2026-42849— authentik: Reflected XSS in SFE AutosubmitStage allows IDP account takeover

Quick assessment

Affected
goauthentik authentik
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

authentik是authentik开源的一个身份提供应用程序。 authentik 2025.12.5之前版本和2026.2.3之前版本存在跨站脚本漏洞，该漏洞源于SFE中阶段的实现问题，可能导致在AutosubmitStage中使用XSS漏洞。

CVSS 9.3 · Critical EPSS 0.36% · P29

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 2

VendorProduct Version RangeStatus
goauthentik authentik < 2025.12.5 affected
< 2026.2.3 affected
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I. Basic Information for CVE-2026-42849

Vulnerability Information
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Vulnerability Title
authentik: Reflected XSS in SFE AutosubmitStage allows IDP account takeover
Source: CVE Program / CVE List V5
Vulnerability Description
authentik is an open-source identity provider. Prior to versions 2025.12.5 and 2026.2.3, due to the implementation of stages in the SFE (Simple Flow Executor) in order to make the interface more compatible with legacy browsers, it was possible to use an XSS exploit in the AutosubmitStage. This issue has been patched in versions 2025.12.5 and 2026.2.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
authentik 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
authentik是authentik开源的一个身份提供应用程序。 authentik 2025.12.5之前版本和2026.2.3之前版本存在跨站脚本漏洞，该漏洞源于SFE中阶段的实现问题，可能导致在AutosubmitStage中使用XSS漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
goauthentik authentik < 2025.12.5 -

II. Public POCs for CVE-2026-42849

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7419 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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POC zip download
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III. Intelligence Information for CVE-2026-42849

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Vendor Advisories for CVE-2026-42849 (1)

Same Patch Batch · goauthentik · 2026-06-02 · 6 CVEs total

CVE-2026-49448 9.8 CRITICAL authentik: SourceStage bypass via empty POST
CVE-2026-49443 8.8 HIGH authentik: `UserSourceConnection.user` and `GroupSourceConnection.group` are changeable th
CVE-2026-47201 8.5 HIGH authentik: XML Signature Wrapping in SAML Source ACS allows authentication as arbitrary fe
CVE-2026-41577 authentik: SAML source does not validate Conditions, timing, or audience on assertions
CVE-2026-41569 authentik: WS-Federation wreply origin bypass can exfiltrate signed login responses to att

IV. Related Vulnerabilities

Same product: authentik
Same vendor: goauthentik
Same weakness: CWE-79

V. Comments for CVE-2026-42849

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